Compact high-zoom-ratio zoom lens

Details Compact high-zoom-ratio zoom lens Compact high-zoom-ratio zoom lens

1998-02-11

1999-12-14

Epps, Georgia

Optical: systems and elements

Lens

With variable magnification

359684, 359686, 359714, 359715, 359740, 359765, G02B 1514, G02B 302, G02B 900, G02B 960

Patent

active

060025271

ABSTRACT:
A compact, high-zoom-ratio, high-performance five-group zoom lens having a positive-negative-negative-positive-positive refractive power arrangement. The zoom lens has the ability to focus at close range with minimal movement of the internal lens groups. Each lens group is axially movable, with the second or third lens group available for close-range focusing. The first lens group includes one negative lens element and two positive lens elements. The second lens group includes two negative lens elements and one positive lens element. The third lens group includes one negative lens element and one positive lens element. The fourth lens group includes two positive lens elements and one negative lens element. And, the fifth lens group includes three positive lens elements and two negative lens elements. An aperture stop is disposed imagewise of the third lens group and objectwise of the fifth lens group. The zoom lens preferably satisfies at least one of a number of design conditions.

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